J/ApJ/807/82 Rotational velocities of APOKASC red giants (Tayar+, 2015)
Rapid rotation of low-mass red giants using APOKASC: a measure of
interaction rates on the post-main-sequence.
Tayar J., Ceillier T., Garcia-Hernandez D.A., Troup N.W., Mathur S.,
Garcia R.A., Zamora O., Johnson J.A., Pinsonneault M.H., Meszaros S.,
Allende Prieto C., Chaplin W.J., Elsworth Y., Hekker S., Nidever D.L.,
Salabert D., Schneider D.P., Serenelli A., Shetrone M., Stello D.
<Astrophys. J., 807, 82 (2015)>
=2015ApJ...807...82T 2015ApJ...807...82T (SIMBAD/NED BibCode)
ADC_Keywords: Abundances, [Fe/H] ; Stars, masses ; Rotational velocities ;
Stars, giant
Keywords: binaries: close; stars: late-type; stars: rotation
Abstract:
We investigate the occurrence rate of rapidly rotating (vsini>10km/s),
low-mass giant stars in the Apache Point Observatory Galaxy Evolution
Experiment-Kepler (APOKASC) fields with asteroseismic mass and surface
gravity measurements. Such stars are likely merger products and their
frequency places interesting constraints on stellar population models.
We also identify anomalous rotators, i.e., stars with
5km/s<vsini<10km/s that are rotating significantly faster than both
angular momentum evolution predictions and the measured rates of
similar stars. Our data set contains fewer rapid rotators than one
would expect given measurements of the Galactic field star population,
which likely indicates that asteroseismic detections are less common
in rapidly rotating red giants. The number of low-mass moderate
(5-10km/s) rotators in our sample gives a lower limit of 7% for the
rate at which low-mass stars interact on the upper red giant branch
because single stars in this mass range are expected to rotate slowly.
Finally, we classify the likely origin of the rapid or anomalous
rotation where possible. KIC 10293335 is identified as a merger
product and KIC 6501237 is a possible binary system of two oscillating
red giants.
Description:
Fundamental stellar parameters were taken from the APOKASC catalog
(Pinsonneault et al. 2014, J/ApJS/215/19) based on Sloan Digital Sky
Survey Data Release 10 (Ahn et al. 2014ApJS..211...17A 2014ApJS..211...17A). To determine
the projected surface rotational velocities of the 1950 APOKASC stars
analyzed, we used both the combined spectrum of each star
(Holtzman et al. 2015AJ....150..148H 2015AJ....150..148H) and the best-fit template
spectrum generated by the ASPCAP pipeline.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 122 1950 Basic properties and projected rotational broadening
measured for each star
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See also:
J/MNRAS/445/2758 : KIC giants Bayesian dist. & extinctions (Rodrigues+ 2014)
J/ApJS/215/19 : APOKASC catalog of Kepler red giants (Pinsonneault+, 2014)
J/ApJ/794/125 : IN-SYNC. I. APOGEE stellar parameters (Cottaar+, 2014)
J/A+A/572/L5 : Evolution state of red giants from seismology (Mosser+, 2014)
J/A+A/572/A34 : Pulsating solar-like stars in Kepler (Garcia+, 2014)
J/A+A/568/L12 : Rotational freq. splitting in Sun-like stars (Nielsen+, 2014)
J/A+A/560/A13 : Stellar rotation in h Per (Moraux+, 2013)
J/A+A/557/L10 : Rotation periods of 12000 Kepler stars (Nielsen+, 2013)
J/AJ/146/156 : APOGEE M-dwarf survey. I. 1st yr velocities (Deshpande+, 2013)
J/AJ/146/133 : Stellar parameters from SDSS-III APOGEE DR10 (Meszaros+, 2013)
J/MNRAS/434/1422 : Atmospheric param. of FGKM stars (Molenda-Zakowicz+, 2013)
J/MNRAS/432/1203 : Rotation periods of M-dwarf stars (McQuillan+, 2013)
J/ApJ/776/67 : Rotational tracks (van Saders+, 2013)
J/ApJ/765/L41 : Asteroseismic classification of KIC objects (Stello+, 2013)
J/ApJ/757/109 : Rotational vel. + Li abundance in K giants (Carlberg+, 2012)
J/ApJ/746/16 : Modelling the convection zone (van Saders+, 2012)
J/A+A/543/A160 : Normalized spectra of 82 Kepler red giants (Thygesen+, 2012)
J/A+A/540/A143 : Oscillations of red giants observed by Kepler (Mosser+, 2012)
J/A+A/537/A120 : Rotational velocities of A-type stars. IV. (Zorec+, 2012)
J/A+A/525/A131 : Solar-like oscillations in Kepler red giants (Hekker+, 2011)
J/MNRAS/423/122 : Abundances of 93 solar-type Kepler targets (Bruntt+, 2012)
J/AJ/142/160 : Kepler Mission. II. eclipsing binaries (Slawson+, 2011)
J/ApJ/732/39 : Rotational velocities of K giant stars (Carlberg+, 2011)
J/MNRAS/412/1210 : Kepler asteroseismic targets (Molenda-Zakowicz+, 2011)
J/MNRAS/408/475 : HATNet Pleiades Rotation Period Catalogue (Hartman+, 2010)
J/ApJS/190/1 : A survey of stellar families (Raghavan+, 2010)
J/AJ/135/209 : Rotational & radial vel. 761 HIP giants (Massarotti+, 2008)
J/A+A/430/165 : Radial velocities for 6691 K and M giants (Famaey+, 2005)
J/A+A/410/671 : X-ray emission in cool main sequence stars (Messina+, 2003)
J/A+A/397/147 : Activity-rotation relationship in stars (Pizzolato+ 2003)
http://www.sdss3.org/ : SDSS-III home page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 I8 --- KIC Kepler Input Catalog ID
10- 26 A17 --- 2MASS 2MASS Object ID (JHHMMSSss+DDMMSSs)
28- 35 F8.2 Msun Mass [0.7/3.6]? Mass relative to the Sun (1)
37- 44 F8.2 Msun e_Mass [0.05/1.5]? Uncertainty in Mass (1)
46- 53 F8.2 Rsun Rad [3.6/102]? Radius relative to the Sun (1)
55- 62 F8.2 Rsun e_Rad [0.1/25]? Uncertainty in Radius (1)
64- 71 F8.2 [cm/s2] logg [0.8/3.3]? Logarithm of gravity (1)
73- 81 F9.3 [cm/s2] e_logg [0.008/0.06]? Uncertainty in log(g) (1)
83- 86 I4 K Teff [3903/5040] Effective temperature (1)
88- 91 I4 K e_Teff [67/1208] Uncertainty in Teff (1)
93- 98 F6.3 [-] [Fe/H] [-2.3/0.6] Metallicity (1)
100-104 F5.3 [-] e_[Fe/H] [0.04/2] Standard error on [Fe/H] (1)
106-106 A1 --- l_vsini Upper limit flag on vsini (2)
107-110 F4.1 km/s vsini [5/22] Rotational Velocity (2)
112-114 F3.1 km/s e_vsini [0/9.2] Uncertainty in vsini (2)
116-122 A7 --- State Evolutionary State ("CLUMP", "RGB" or
"UNKNOWN") (3)
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Note (1): Fundamental stellar parameters from APOKASC catalog; Table 5,
"Scale 2 Asteroseismic Results" from Pinsonneault et al.
(2014, J/ApJS/215/19)
Note (2): Three measurements are made of each rotational velocity and a mean
and standard deviation of these measurements is computed.
Values below 5 km/s are considered non-detections and
replaced with a value of <5.
Note (3): Evolutionary states from Stello et al. (2013, J/ApJ/765/L41)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 17-Nov-2015